Step 5 on the Bridge Guide instructs to
Replace "TODO1" with a Tor port of your choice. This port must be externally reachable.
but I don’t know which ports are even an option or what the benefits/cons are of using some over others. Can someone provide some guidance, please?
I think it is ok to just select random number between 1 and 65535.
I came across these details on port designations on Google IT Support Professional Certificate so I think there may be some distinction of better ports after all:
"* Given the number of ports available, they have been divided into three categories by the Internet Assigned Numbers Authority (IANA): System Ports, User Ports, and Ephemeral Ports.
System Ports: Identified as ports 1 through 1023. System ports are reserved for common applications like FTP (port 21) and Telnet over TLS/SSL (port 992). Many still are not assigned. Note: Modern operating systems do not use system ports for outbound traffic.
User Ports: Identified as ports 1024 through 49151. Vendors register user ports for their specific server applications. The IANA has officially registered some but not all of them.
Ephemeral Ports (Dynamic or Private Ports): Identified as ports 49152 through 65535. Ephemeral ports are used as temporary ports for private transfers. Only clients use ephemeral ports.
Not all operating systems follow the port recommendations of the IANA, but the IANA registry of assigned port numbers is the most reliable for determining how a specific port is being used. You can access the IANA Service Name and Transport Protocol Port Number Registry here or check out this helpful list of commonly used ports."